Mouse over the word 'info' for information on how to fill in the information for each field.
To more precisely estimate job costs use the calculator and print off what you entered. When the job is finished compare the actual numbers to the ones you entered and look for the differences. As you get better at refining the variables the calculator accuracy will improve.
If you have any questions regarding the estmator please visit our forum.
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This is the metric calculator... if you would rather use the standard measures version click here.